Emc Corporation

Other

David Joshua Brown

Arieh Don

Patrick Brian Riordan

Michael J Scharland

Kenneth A Halligan

Helen S Raizen

Michael E Bappe

Described are techniques for allocating resources. Two consumer processes using two resources are provided. A first threshold of a first of the resources for a first of said two consumer processes is provided. A second threshold of a second of said resources for said first consumer process is provided. Consumption information is received regarding actual consumption of the two resources by the first consumer process. Execution of the first consumer process is scheduled in accordance with the first and the second thresholds and the consumption information.

Controlling resource allocation using thresholds and scheduling

Described is a distributed copying technique that may be used in migrating large amounts of data from one or more source devices to one or more destination devices. The data source is divided into partitions. As Fibre Channel adapters (FAs) become available, each of the FAs may copy a partition of the data. In connection with specifying paths used for the distributed copying technique, a preferred path selection (source port-target port mapping) may be made by executing code in a controlling data storage system to perform discovery processing. The preferred path selection is used for the duration of the distributed copying unless the preferred path is unable to transmit data. A target port of the preferred path may be randomly selected from all accessible target ports, and/or in accordance with a specified portion of the target ports. Preferred paths may also be specified using an API (application programming interface).

Path determination using preferred paths or randomly selecting source and target ports

Described are techniques for overriding an existing device reservation. Discovery processing is performed by a first data storage system to locate a specified device. The discovery processing includes determining whether there is a reservation conflict for said device of a second data storage system. If there is a reservation conflict for the device, a command is issued from the first data storage system to the second data storage system during said discovery processing to create an override for said reservation conflict. The override causes processing to be performed at a subsequent point in time so that an existing reservation associated with the reservation conflict is overridden in connection with performing a first process on said first data storage system.

Techniques for overriding device reservations

Described are techniques for use with online data copying or migration. Data is pushed from a source to a target device while one or both of the source and target devices are available for use by one or more host systems. The host systems may perform I/O operations to the source and/or target devices while the data migration is ongoing if a copy session is defined on the data storage system(s) of the source and/or target devices. A copying operation performs data migration from the source to the target device. A migration vector is used to indicate which portions of the source have been migrated. A change vector may be associated with each of the source and/or target devices to indicate portions that have been modified in order to perform a differential copy operation.

Online data migration

Method for suspending a discovery process, saving the state of the discovery process, and resuming the discovery process during a distributed copy operation

Described are techniques for use with an error handling policy for a data storage system. Error handling criteria may be specified for controlling behavior of the data storage system upon the occurrence of an internal processing error occurring when performing an ancillary task associated with a data operation received by the data storage system. The error handling criteria may include a threshold counter value, and one or more of: a device, a specific device location or address, and a host. An error may be conditionally returned to the host upon the occurrence of an internal processing error in accordance with the error handling criteria.

Error handling policy

Described is a distributed copying technique that may be used in migrating large amounts of data from one or more source devices to one or more destination devices. The data source is divided into partitions. As Fibre Channel adapters (FAs) become available, each of the FAs may copy a partition of the data. A copy indicator value indicates the last partition delegated to an FA for copying. The last FA to complete copying is responsible for ensuring completed copying of any other data partitions delegated to an FA which has died during migration of the other data partitions. In the event that the last FA dies prior to completing its processing, additional steps are performed by other remaining FAs to copy all data partitions not known to be successfully migrated.

Distributed workflow techniques

A reusable tie down is provided having a threaded portion for insertion in soil along with an arcuate head defining an aperture for securing a rope or line to the tie down. The tie down is constructed of a high impact, high tensile strength polycarbonate which may be deformed under a heavy load and then returned to a normal shape by the application of heat.

Reusable threaded tie down

Disclosed is a support mechanism that may be installed onto a conventional bed to assist a person into and out of a bed. The support mechanism comprises a tubular support member formed with a pair of vertical and substantially parallel legs, each of which is adapted to fasten to the vertical extending portion of a side rail. The support mechanism may further comprise a clamp which is adapted to connect one of the legs to the bed post.

Support mechanism for a bed

Disclosed is a support mechanism that may be installed onto a conventional bed and/or a hospital bed frame to assist a person into and out of a bed. The support mechanism comprises a tubular support member formed with a pair of vertical and substantially parallel legs, each of which is adapted to fasten to the bed frame.

A heated ceiling fan comprising a plurality of blades with heating means in each of the blades.

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Chelmsford, MA, United States of America

David Joshua Brown